Grinding machine



Sept. 4, 1934. w. c. OSTERHOLM GRINDING MACHINE Filed Feb. 19, 1930 6 Shets-Sheet l v Sept; 4, 1934- W. c. OSTERHOLM 1,972,160

GRINDING MACHINE Filed Feb. 19. 1930 6 Sheets-Sheet 2 P 4, 1934- w. c. OSTERHOLM GRINDING MACHINE Filed Feb. 19. 1930 6 Sheets-Sheet 5 mmxwsw n? m i--- g P 1934- w, c. OSTERHOLM 1,972,160

GRINDING MACHINE Filed Feb. 19. 1930 6 Sheets-Sheet 5 P 4, 1934- w. c. OSTERHOLM GRINDING MACHINE Filed Feb. 19. 1950 6 Sheets-Sheet 6 mnv Patented Sept. 4, 1934 V 7 1,972,160

.. UNITED STATES, PATENT OFFICE GRINDING MACHINE William 0. Osterholm, oak Park, I l. Application February 19, leap, 429,600

16 Claims. '(Cl. 1* 1z1) The'invention relates to grinding machines. Figure 2 is a front elevationof the machine, as -Mo reparticularly the invention relates to mashown in Figure 1. '3 chines for surface grinding work where the work; Figure B is a rear elevation of the machine. after being secured to a work table, will be auto- Figure 4 is a sectional view taken alongyline matically fed to a grinding wheelso that the"de'-' of Figure vl-and looking in the direction of Q sired thickness of metal may be ground off and the arrows." l simultaneously with this operation will be -fFigureE-isa'sectional view showing the clutch oscillated across the face of the grinding wheel, arrangement for the oscillating and feeding i the oscillations continuing during the duration mechanism. I of the feed. Figure Bis a sectionalview taken alone line 6 Another object of the present invention is to 6-6 'of Figure 5. provide a grinding machine in which the work Figure 7 is ai'plan view showing the arrange may be expeditiously set up and in which the ment of driving and driven shafts with their I H grinding ope-ration may be performed with a cooperating pulleys; i

'15- minimum of attention from an operator. Figure'8 isa detail sectional view showing the 76- A further object is to provide a grindingmaautomatic clutch disconnecting mechanism. chine of the type described, in Whichthe wear Figure 9 is a sectional view along line 9-9 of of the grinding wheel may be readily com- Figure 4, showing the adjustment for the oscilpensated for, thereby eliminating costly delays lating mechanism. in operation. Figure .10 is .a sectional view along line 10-10 A further object is to provide a grinding maof Figure 4." 7 M chine, in which oscillation of the work must first 1 The illustrated embodiment of the invention take place before feeding of the work to the comprises a base 1, Figure 2, supporting a frame grinding wheel can initiated. a 2 within which is housed the operating parts of A further object is to provide a grinding ma'- the grinding machine. Also mounted on base: 1 80.. chine of the type described, which i will be is a motor 3 for providing the power for driving equipped with means for allowing a wide'r'ange' the mac i e t u a counter Shaft 4 having in the adjustability of the oscillating mechanism; connection withthe motor through belt 5. The in addition to allowing numerous adjustments of counter shaft is supported from the .base by 39 th f edin mechanism so that a varied charmeans of an armfi and adjustable rod 7, the arm acter of work can be accommodated by the ma- 6 being pivoted eccentrically at 8 to a shaft 9. hi a By adjustment of the shaft 9 the efiective length A further object'is to provide a grinding maof the arm 6 can be varied so as to maintain at chine having mechanism capable of fine adjustall times proper tension on the various belts 35? ment for causing feeding of the grinding wheel operating from the counter shaft. towards the work independent of the feeding 'The frame 2 is provided with a. cylindrical mechanism for the work itself, whichmchapor ion Figure Within which is adapted to nism will also embody water cooling means for be mounted soas to have sliding movement v preventing overheating f th wh l, therein,;a spindle housing 11. A spindle 12 is A yet further object is to provide a grinding jolll'naled W h hOuSlng y means of a ball- 95.: mechanism having means whereby, on the combearing 13 i -O d'and a thrust-bearlng 14 pletion of a predetermined grindingoperation, etrihejopposlie end-i For mamtammg 'P Pf the oscillating and feeding mechanism will be posmon the thruSt'bea'rmg* the housmg 1S interiorly threaded at 15 for accommodating a automatically stopped and the table tilted lnto cap 16. 7 At the rear end the Spindle 12 has keyed position forthe workmen toconveniently' remove to it a pulley l7 and is also provided at this the finlshed work and mounta new piece of work end a cap 18 Supported from the spindle Gil thereon.

houslng by means of a'bracket l9. Fungal ObJects Wm appear as the descnpnon Thecap 1-8 is adapted to have connected to it so pmcee any suitabletype of hose for conducting water n t drawings. which t ea embodithrough' a pipe 20 located centrally within the ment of the device and wherein llke reference spindle .12 and extending its full length. The

characters are used to designate like parts pipe 20 at the front end terminates in -a noz- Figurel is a side elevation illustrating one emzle -21 having openings22 providing outlets for bodiment of the present invention. the water. I llO The spindle 12 has a wedge shaped head 23, which carries a cup shaped holder 24, for supporting the grinding wheel 25. The holder 24 may be described as a double annulus having two concentric circular walls 26 and 27. Of these walls the inner one 27 is screw threaded and carries the nut 28 provided with holes for the reception of a spanner wrench whereby the'nut may be moved to the desired position longitudinally of the'axis ofthe spindle 12; The wall 26 is inclined towards the spindle on its innerside so that the space enclosed thereby is of less diameter near the bottom of the holder 24. Fitted within the conical surface provided bythe wall 26 is a ring 30 which may be split and provided with a conical contour on its exterior surface to,

fit the surface of the wall 26. This ring is shaped interiorily so as to have correct fitting engagement with the grinding wheel bolts 31 serving to draw the ring within the holder to hold the grinding wheel 25 in position; By adjusting the nut 28, any position of the grinding'wheel 25longitudinally of the spindle 12"may be secured as desired. j *i For feeding the grinding wheel towards the work it is necessary that the housing '11 have movement within the. frame portion 10. 'For this purpose a hand wheel 32is provided secured to shaft 33, journaled within a tube 34, shaft 33 being providedwi'th a worm gear 35, meshing with a worm gear 36 on shaft 37,1journaled within a bracket 38; The bracket is integralwith a cover' 40 secured to the portion 10.which cover has journaled therein a longitudinally extend= ing threaded shaft 41, having atone end a. square portion 42 and'atits other end a gear 43, meshing with worm gear 44 keyed to shaft '37. Tthreade'd on shaft 41 is a nut 45 located within a slot 46 on the cylindrical portionxlO. The nut 45 at itslower end is provided with a. depending portion 47 for fitting within :a groove 48 in the spindle housing 11, in which position the nut is adapted to besecured tov the'housing by screws 50. A boss 51 provided onathe cover I 40 has an opening for'allowin'g passage of a suitable instrument so that "access can be had, to the screws 50. l A

i t will thus readily be seen that by rotation of hand wheel 32 similar rotation will be imparted to the threaded shaft 41. This rotation will cause the nut 45 on it to have movement in accordance with the particular rotation given to shaft 41. This movement of the nut .45 will cause corresponding movement of thespindle housing 11, as the two are secured together as described. A spring 52 secured to the frame 2 at one end and to the spindle housing 11 by means of a bolt 53 at its other end serves to re-' duce the vibrations of the spindle housing caused by the rotating grinding wheel 25, and also serves to take up the slack between the threads on the shaft 41 and the nut 45. It is often desirable to cause movement of the spindle housing 11 independent of the fine adjustment given to it through actuation of the wheel 32 and for this proper position he will set in motion, through actuation of levers to be described, mechanism which will have the effect of moving the work table up into operative position maintaining the work table in such position during the grinding operation and also producing a reciprocatory movement of the work across the face of the grinding wheel as well as to cause a feeding of the Work towards the grinding wheel. At the completion'of the cycle inaugurated by operation of the lever, the work table will-be automatically withdrawn from operative position and the oscillating movement as well as the feeding movement of the work table will be stopped. The mechanism for producing these results will be described.

- v The frame 2 provides a bearing surface at 56 and 57 for journaling therein a trunnion 58. The bearing 57 provides a journal for the trunnion by reason of a split ring 60, which engages the rear portion of the trunnion on its interior surface and the frame;- on its exterior surface. A cap 61 issecured to the ring and is spaced a suitable distance from the frame so that it will not interfere with the movements ;of the trunnion. The trunnion on its front end is adapted to have secured to it the work support 62, by m ans of a series 'of bolts 63,'Figure 2, .the support inturn having pivoted to it by pins 64, a work table 65. -Mounted within-the work support 62 is a yoke member 66, provided with a bearing 67 pby means of which the yoke is pivoted to the trunnions 68 of the work support. The arms '70 of the yoke are provided with trunnions 71,, upon which .are pivotally mounted the links 72, pivoted at their upper ends to the work table bymeans of a bar 73. With the'work table in upright position, it will be noted that the arm 74 has engagement with a stop '75and also that the ends '76 ,ofthe work table engage the stop members '77 secured to the work support 62, Mounted at substantially the center of the yoke 66-by means, of a ball and socket 78 is an actuating rod 80, adapted to extend the full length of the machine andhaving its rear end secured to a lever 81by means of a ball and socket 82. The lever 81 is in turn pivoted to the frame 2 by means of a-pin 83, Figure 4. Upon actuation of lever sl it will be seen that the movements imparted to the rod 80 will cause the yoke 66 mounted within the work support 62, to raise or lower the work table 65 by means of the toggle joint comprising the arm and links '72. q

The mechanism for actuating lever 81 comprises a feeding drum 84 mounted for rotation upon a bearing 85 secured to the frame 2. .The feeding drum is provided with a gear wheel 86 having on its face a cam race 87. Upon the periphery of the drum 84 is formed a cam race 88 and a cam race 89. Adapted to run within thecam race 88 is a roller 90 secured to a lever 91. Also secured to the lever on the side opposite the roller 90 is a link 92 havingits other end pivotally secured to the lever 81 at 93 substantially its mid-portion. The lever 91, Figure 3, is provided at its lower end with a bearing portion 94, the portion being loosely mounted upon a cross'shaft 95, journaled at its ends within the frame 2., v I I Referring to Figure 4 it will be noted that the cam race 89 provided on the feeding drum 84 is adapted'to haverunning therein a roller 96, suitably connected to a lever 97 provided on its lower end with a bearing portion '98, by means of which portion the lever is keyed to shaft 95. Also keyed to shaft 95 is *a'lever arm 100' provided with an arcuate cam race 101. A feed lever 102 is provided with'a roller 103' for operating within the cam race 101, the 'lever at its opposite end being provided witha fork 104. An arm .105 pivotally secured from frame 2 as at 106, is provided with notches 107 for engagement upon a pin 108, provided in the fork 104. The lever is adapted to be manually lifted to disengage the pin 108 from its notch 107, whereupon the feed lever 102 can be rotated so as to vary-the position of 1 the roller 103 within the cam race101. This will correspondingly locate the pin 108 in another one of the slots 107. Various adjustment of the roller 103 within the cam race 101 can be obtained in this manner.

:The feed lever 102 has pivotal connection at 109, substantially its mid-portion, with the front feed link 110 and a rear feed link 111. This connection is accomplished by forming a fork 112 on the end of the link 110 into which the link 111 fits, both links being thus pivoted to pin 109. The other end of link 111 is pivotally secured by means ofits hub-portion 113 to. a pin 114, havingconnection with yoke 115 to be later described. The other end of link 110 by its hub 1161s pivoted to aneccentric pin 117, which pin is eccentric to a stud .118 fitted within the bearing 119. By a slot on the outer face of the stud, the same may be rotated and then secured in the desired position. This eccentric is provided for the purpose of varying the distance between the pivots points 117 and 114 of the various links.

By'the particular configurations given to cam race 89 thelever 97 will'have imparted to it, as roller 96 rides within the cam race, arocking movement which is thus transmitted to shaft 95 =and to arm 100. This movement of the arm through its connection with feed lever 102 causes the lever to have movement in a vertical directionof various magnitudes depending on the particular location of roller 103 within the cam race 101. Considering the pivot 109 to be lowered by reasonof adipping of arm 100 it will be seen that the straight link connection between the pivot points 114 and 117 will be broken causing a shortening of the distance between said points. As the pivot pin 117 is secured within bearing 119 to the frame, the pivot pin 114 will be correspondingly moved. This movement in actual operation of the machine may vary fromsubstantially one-eighth of an inch tosubstantially one-hundredth of an inch, depending on location of roller 103 in race 101, which is adjusted by the location of the pin 108 in slot 107 on arm 105. i

The operations for imparting movementsto the pivot pin 114 is to cause the'feeding of the work piece to the grinding wheel 25 which is accom-' plished by transmitting these movements to the trunnion 58. For this the yoke 115. loosely journaled on shaft 95, is provided with arms 120 and 121, Figure 3. To the arm. 120 is secured the pin 114 connecting the feed link 111 to the yoke. Also connected to the yoke by means of the arms 120 and 121 is a collar 122 having pins on each side which are connected to the arms. The collar 122 is.mounted on the trunnion 58 in such a manner as to transmit extremely slight longitudinal movements to the trunnion while allowing the trunnion to have an oscillating movement.

- 125 mounted for rotation in bearings 126 integral with the collar. The worm gear 125 has meshing engagement with gear teeth 127 provided on the periphery of the trunnion, seel 'igure 1. By rotation of the gear 125 through rotation of the shaft 128', the collar can be located in any desired position on the circumference of the trunnion. Also adjustably secured to collar 124 is a pin 130 having a round end 131. Secured to the pin by engaging the end 131 is aconnecting rod 132, engaging at its other end a similar pin 133. By reference to Figure 10 it willbe seen that the pin 133 is integral with a plate 134 mounted upon the face of a drum 135 through means of guides 136. The plate is provided with gear teeth 137 on its'upper edge, which meshes with a pinion 139, keyed to shaft'140, and also a dove-tail slot into which is fitted a locking bar 141, having threaded to it two rods 142 and 143, the former providing'means for loosely journaling a-"pinion 144adapted to mesh with the indexing pinion'145, keyed to shaft 1401' Each of the rods 142 and 143 have keyed to them an actuating nut 146, so that by rotation of the nut the rods will lock the bar 141 within the dove-tail slot, thus locking the plate 134 in place. To adjust the eccentricity of the pm 133 and thus the magnitude of the oscillations given to the trunnion," it is only necessary to unlock the plate 134 and rotate theindex pinion 145 to vary the position of the plate in the guides 136. The drum 135 rotates within the bearing l47secured to the frame andis provided with a work gear 148. I I

"It will be noted from the mechanism' previously described that by rotationof gear wheel 86, the feed drum 84 Wl11 be rotated to actuate the raisingand lowering of the work table 65 and simultaneously actuate the feeding mechanism for imparting longitudinal movements to the trunnion 58. By rotation of gear wheel 148 it will also be notedthat the mechanism necessary to give oscillations to the trunnion will be brought into operation. A feature of the present'inven- 'tion resides in a form of clutch construction whereby powermay be'supplied to both gear wheels simultaneously, but whichprevents operation of the gear 86 for actuating the feeding mechanism until the oscillating mechanism has been actuated. This is a safety'measure so that I the work piece will be oscillating across the face of-the grinding" wheel 25 as the same is fed to the wheel. This clutch arrangement will accordingly be described.

The machine. is provided with two operating levers, lever 150 for throwing into and out of engagement the driving means for the oscillating arm 153 has secured'to its end a pin 155, while arm 154 terminates in a surface provided with a diagonally disposed slot 156.

The clutch and driving mechanism comprises a unit which can be bodily removed from machine and includes a plate 158 for attachment to the frame, having portions 159 on which are jour naled the shaft 160. To this shaft is secured the forked arm 161 adapted to straddle the pin and also the yoke 162, having arms 163. The driving shaft 164 is mounted forrotation on the plate. 153 and is provided at its inner end with a worm gear 165 adapted to mesh with gear-148 its and has loosely mounted on its outer end a cone pulley 166, having an internal'clutch surface 167 for engagement by a clutch disc 168. The disc is keyed to shaft 164 but slidable thereon and is provided with a collar 169 engaged by the arms 163, through pinions 170. Springs 171 serve to resiliently press and maintain clutch disc 168 within the surface 167. By rotation of shaft 160 through movement imparted to arm 161, the collar 169 can be. actuated to throw into and out of engagement the clutch disc v168.

Also mounted for rotation in plate 158 is a driving shaft 172, provided on its inner end with the worm gear 173 for meshing with gear 86 and has loosely mounted on its outer end a gear wheel 174. Keyed to the shaft but slidable thereon is a clutch disc 175 provided with a groove 176, the disc meshing with a clutch surface 177 of similar contour integral with gear 174. A lever 178 journaled on pin 179 and having arms 180 is adapted to actuate the disc as the arms 180 fitwithin the groove 176. By movement of operating lever 151, the arm 154 will impart desired movement to arm 178, so as to throwinto meshing engagement the clutch disc 175, whereupon the driveshaft 172 will be driven from gear wheel 174. An idler shaft 181 also mounted on plate 158 is provided with a pinion 182 meshing with gear 174 to accomplish speedreductions in the revolutions of shaft172. A chain 183 serves to drive the idler shaft 181 from shaft 164. .It is thus seen that since the shaft 172 is driven from the shaft 164 that it will be necessaryto first throw into operation the clutch disc'168 to supply power to the shaft 164, before power can be secured therefrom for driving the shaft 172. However, it is possible by the arrangement described to allow shaft 164 to operate but throw shaft 172'out of operation through actuation of the clutch disc 175.

7 Referring particularly to Figure 7 it will be seen that the counter shaft 4 driven by motor 3, Figure 2 through belt 5 is provided with a pulley 185 and a cone pulley 186. By means of a suitable driving belt the pulley 185 isoperatively connected so as to drive the spindle 12 through means of its pulley 17. The cone pulley 186 also through suitable connecting belt, drives a cone pulley 187, keyed to shaft 188, which shaft is mounted within a journal box 189 secured to the frame. The shaft 188, through suitable worm gears, drives a right angle shaft 190, also jourclutch which will serveto allow acycle of operto the frame, havin pin 197 secured thereto for operation within the cam race 87, provided on the face of the gear wheel 86. At the outer end the link is provided with a hook 198 for engaging a pin 199, located on a finger of. the

forked arm 161, and is spring pressed in a direction towards the pin 155 by means of a spring 200. The cam race 87 is of such a. contour as to allow one revolution of the feeding drum 84 before the detent 201, Figure 3, provided in the cam race will engage the roller 197 to withdraw the .link 195. As the link is springipressed in the proper direction, this rearward movement serves to withdraw the forked arm 161, since the hook 198 will have engagement against pin 199. As a result of the actuation of the forked arm 161, the clutch disc 168 will be thrown out of engagement with the pulley 166 and thus the oscillating mechanism driven by shaft 164 will stop, alsoserving to stop the feeding mechanism driven through shaft 172. V

The mode of operation of the machine resulting from the operator actuating the lever 150 is as follows: 7 As stated before, with the motor in operation, the grinding wheel will be continuously operated as will also the cone. pulley 166. Actuation of lever 153 will cause actuation of the clutch disc 168, so that the drive shaft 164 willbe operatively connected to the cone pulley 166. Rotations will thus be imparted to shaft 164 and shaft172, which will be in turn transmitted to the gear wheel 148 to cause oscillating movement of the trunnion 58 and to the drum 84, through gear 86 to cause raising and lowering of the work table and the feeding of the work table towards and away from the grinding wheel. The raising and lowering of the Work table is accomplished through roller 99 running in cam race 88 which imparts pivotal movement to lever 81 and thus to the actuating rod 80. The reciprocating movements of the actuating rod is transmitted to the work table in the form of pivotal movement through the arm '79 and links 72.

During the rotation of drum 84 to cause movement of the work table as described, the roller 96, running in the cam race 89, will simultaneously impart the desired movements to lever 97. As lever 97 and lever arm are keyed to the same shaft, the movements will be imparted to the feed lever 1G2. Through the links and 111, connected to the feed lever, the lever and pin 109 carried thereby will be given a deflection which will vary in magnitude depending on the location of roller 103 in the cam race 101. These deflections will be transmitted to pivot point 114 and thus through yoke 'and collar 122 to the trunnion 58 thus causing reciprocating movement of the work table 65in a direction towards and away from the grinding wheel 25.

Various adjustments of the feeding mechanism just described is provided for as the eccentric stud 118 allows adjustment of the pivot point 117. With the links 110 and 111 in a straight line it will be seen that relative location of the pivot point 114 can be accordingly varied to allow adjustment of the trunnion 58. It is also necessary to at times oscillate the work table across the face of the grinding wheel wholly on one side or on the other side of a vertical center line.

For this purpose the collar 124 which imparts the oscillations to the trunnion through connection with the eccentric pin 133 can be adjustably located at any position on the trunnion by merely rotating the worm gear 125. Also the magnitude of these oscillations can be varied within a wide range as the eccentricpin 133 has adjustment on gear 148, which is accomplished by merely rotating the index wheel 145 after the locking mechanism has been released.

movement to the table towards and away from the wheel, a shaft for driving said other means,

It will be recalled that one of'thefeatures of the present invention. resides in automatically stopping the oscillating and feeding mechanism on completion of a predetermined grinding operation. This grinding operation is performed during one revolution of'drum 84. It istherefore necessary to actuate theclutch mechanism once. every revolution of this drum, allowing the operator, through the'lever 150, to start the operations again. For this purpose theclutch mechanism is provided with a link 195, having a roller 197 operating within cam race 87, provided with a detent 201,- Figure 3, which once in everyrevolution of the drum serves to withdraw the link 195. On the outer end ofthe link is provided a hook 198 for engaging apin 199 on the forked arm 161. Upon'withdrawing the link 195, the hook engages the pin and actuates arm 161 to disconnect from their operating means the driving shafts 164 and 172.; Figure 8 shows the mechanism just described in this position. To start operation of the machine again it-is only necessaryfor the operator, through lever 150, to release the forked arm 161 from engagement with the link 195, thus connecting the driving shafts with the cone pulley 166.

One embodiment of the present inventionhas been described in detail. Many modifications will occur to those skilled in the art. It isintended in this patentto cover all such modifications that will fall within the scope of the invention as defined by the appended claims.

I claim:

1. In a grinding machine a grinding wheel having a face normal to its axis, a housing carrying said wheel, a work table, means for oscillating said table across the face of said wheel, and other means for elevating said table to operative position and simultaneously imparting a feeding movement to the table towards and away from the wheel in a direction normal to the face of the wheel.

2. In a grinding machine a grinding wheel having a face normal to its axis, a housing carrying said wheel, a work table, means for oscillating said table across the face of said wheel, a shaft for driving said oscillating means, other means for elevating said table to operative position and subsequently imparting a feeding move- ::ment to the table towards and away from the wheel, a shaft for driving said other means, said last mentioned shaft being driven from the first mentioned shaft.

3. In a grinding machine a grinding wheel having a face normal to its axis, a housing carrying said wheel, a Work table, means for oscillating said table across the face of said wheel, a shaft for driving said oscillating means, other means for first elevating said table to operative position and subsequently imparting a feeding said last mentioned shaft being driven from the first mentioned shaft, and a clutch for throwing "into and out of operation the first mentioned "shaft.

4. In a grinding machine, a frame, a grinding wheel rotatably mounted in the frame, a work table, a trunnion journaled in the frame to which the work table is pivoted, a drum rotatably mounted on the frame, a plurality of cam races provided on said drum, means operated from one race for imparting pivotal movements to the work table, and other means operated fromthe second" firace for imparting feeding movements to the trunnion toimove the work table towards and away from the wheel.* 1

5. In a grinding machine, a frame, a grinding Wheel rotatably. mounted in the frame, a work table, a trunnion journaled in the frame to which the, work table is pivoted, a. drum. rotatably mounted on the frame, a'plurality. of cam races provided on-the periphery of said' drum,-levers adapted to be actuated by said races uponrotation of the drum, one lever. imparting pivotal movements to the Work table, and means opera-v tively connected to the other lever adapted to impart feeding movements to the trunnion to move the work'table towards and away from the wheel." I I 6. In a grinding-machine, a frame-a. grinding wheel rotatably mounted in the frame: a work table, a trunnion journaled in the frame to which the. work; table is pivoted, a drum rotatably mounted on the frame, a cam race provided on said drum, a lever arm adapted to be actuated by said race, a feed lever 'operativelyassociated with said arm, links connected with the feed lever, and

tuated by rotations of saiddrum, a feed lever.

operatively associated with arm, linkspivoted to the feed lever, a. collar mounted on the trunnion,- one of said links being secured to thev fr'ame,= the other link having connection to the collar, whereby actuations of the lever arm will betransmit-f ted to the trunnion. 8. In a grinding machine, a frame, a grinding wheel, a work table, a trunnion journaled in .the

frame to which the work table is pivoted, a drum.

rotatablymounted on "thefrarne, a lever arm actuated by rotations of said drum, an arcuate cam slot in said lever arm, a feed lever adjustably connected to the lever arm through the cam slot, links pivoted to the feed lever, a collar mounted on the trunnion, one. of said links being secured to the frame, the other link having connection with the collar, and means for rotating said drum, whereby actuations of the lever arm will be transmitted to the trunnion.

9. In a grinding machine, a grinding wheel having a face normal to its aXis, a housing carrying said wheel, a work table for supporting work to be applied to the wheel, means oscillating said 1 table across the face of the wheel, and other means elevating said table to operative position and imparting a feeding movement to-the table towards and away from the wheel, said other means being driven from the oscillating means.

10. In a grinding machine, a grinding wheel having a face normal to its axis, a housing carrying said wheel, a trunnion mounted for rotation and movement axially thereof, a work table pivoted to an end of the trunnion and having an operative. and inoperative position, oscillating means for the trunnion to move the work table transversely of the face of'the grinding wheel,

cam means driven from the oscillating means and having connectiontherefrom to the trunnion and alternatelylocate the same in -operative and inoperative position and to move the trunnion trunnion journalled in the frame for rotation and for movement longitudinally thereof, a work table carried by the trunnion, a drum rotatably mounted in the frame and having a cam race on its periphery, a lever arm actuated by '10 said cam race, connections from the lever arm to the trunnion whereby the trunnion is caused to move longitudinally upon actuation of the arm, said connections including means for'varying the extent of movement of the trunnion.

12. In a grinding machine, a frame, a grinding wheel rotatably mounted in the frame, a trunnion journalled in the frame for rotation and for movement longitudinally thereof, a work table carried by the trunnion, a drum rotatably mounted in the frame and having a cam race on its periphery, a lever arm actuated by said cam race, connections from the lever arm to the trunnion whereby the trunnion is caused to move longitudinally upon actuation of the arm, said connections including means on the lever arm for varying the degree of movement of the trunnion, the actuations of the lever arm being of uniform magnitude. M

13. In a grinding machine, a frame, a grind- 30. ing wheel rotatably mounted. in the frame, a trunnion journalled in the frame for rotation and for movement longitudinally thereof, a work table carried by the trunnion, a drum rotatably mounted in the frame and having a cam race on 1 its periphery, a lever arm actuated by said cam race, connections from the lever arm to the trunnion whereby the trunnion is caused to move longitudinally upon actuation of the arm, said connection including a lever connected to the 1 frame and a second lever connected to the trunnion, and means pivotally joining the other ends of the levers and having operative association with the lever arm.

14. In a grinding machine, aframe, a grinding wheel rotatably mounted in the frame, a trunnion journalled in the frame for rotation and for movement longitudinally thereof, a work table carried by the trunnion, a drum rotatably mounted in the frame and having a cam race on its periphery, a lever arm actuated by said cam race, connections from the lever arm to the trunnion whereby the trunnion is caused to move lon- -gitudinally upon actuation of the arm, said connection including a toggle joining a member on the frame with the trunnion, and means operatively associating the toggle with the lever arm.

15. In a grinding machine, a frame having a grinding wheel, a trunnion supporting a work table journalled in the frame and mounted for axial movement, means rotated by the driving means for the grinder and operative to impart oscillation to a feed lever, an arcuate slot formed on the lever, connections from the lever to the trunnion whereby axial movement is imparted to the trunnion upon actuation of the lever, said connections having association with the slot for varying the magnitude of the movements of the trunnion.

16. In a grinding machine, a frame having a grinding wheel, a trunnion supporting a work table journalled in the frame and mounted for 'axial movement, means rotated by the driving means for the grinder and operative to impart oscillations to a feed lever, an arcuate slot formed on the lever, links pivoted to each other and to the frame and trunnion respectively, connections from the links to the feed lever, said connections having location in the arcuate slot and pivotal securement to the links, whereby movement is transmitted from the feed lever to the'trunnion, the magnitude of the movements of the trunnion being varied by altering the location of the connection in the arcuate slot.

WILLIAM C. OSTERHOLM. 

